cuartillo

cuartillo, quarter-celemin (a traditional unit of dry measure equivalent to about 1.2 L); cuartillo, quarter-azumbre (a traditional unit of liquid measure equivalent to about 0.5 L); cuartillo, quarter-real (a former coin or unit of account in Spain and parts of Latin America)

Inherited from Old Spanish quartillo (“little fourth”), from quarto + -illo (“-elle: forming diminutives”), from Latin quartus (“one-fourth”). Equivalent to cuarto (“fourth”) + -illo (“-elle: forming diminutives”). Doublet of cuartilla. Cognate with Galician cuartillo and Portuguese quartilho.